Vivian Lindsey (left) and Marcelline Mitchell sit at a table in front of two balances weighing ore. Next to each women is a table holding glass containers. This photograph was published in the Oregon Journal on Sunday, February 24, 1946 (negative 4 of 8).

Ervin Lindsey uses a photo cell color test to test ore at the Alcoa Mining Company laboratory in Hillsboro. Standing in front of a table, Lindsey makes adjustments on a machine, which can be seen next to a line of test tubes. This photograph was published in the Oregon Journal on Sunday, February 24, 1946 (negative 5 of 8).

Chemist Joseph D. Bryant places ore into a furnace at the Alcoa Mining Company Laboratory in Hillsboro. He holds the small beaker with a long metal rod. This photograph was published in the Oregon Journal on Sunday, February 24, 1946 (negative 1 of 8).